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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b237d0f1e9eb36d550903a97acab294942dc57033c5de4f71d70098a076231da' 
  AND token = 'ck9/HpArA1v0xEeQC22dQBNz2b0XYTo7isIJqqs2M7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}